Ok I know that the oil in the spark plug wells means that the valve cover gasket is leaking. I replaced it about a month or two ago but DID not do the spark plug well gaskets (I know dumbass right here). I wanted to know if i can leave it go for a while cause I lack the time to change it. I also want to know if I have to buy a new outside gasket because I have a newer one already installed.

Just buy the spark plug rings, shouldnt take more than 15 minutes to do it.